LM26

更新时间： 2024-11-28 22:04:55

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
6页	133K
描述
Adapter Interface Circuit

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LM26 数据手册

April 2001

LM2601

Adapter Interface Circuit

General Description

n LM2601 shuts down automatically when adapter is

removed

The Adapter Interface Circuit (AIC) is used to sense the

presence of an external power source for a portable com-

puter. It notifies the computer if a source is present and

indicates if the source is appropriate for charging battery

packs inside the computer. The AIC also senses an adapter

current and its direction. AIC isolates the adapter and signals

the computer when peak current threshold is exceeded.

n Low leakage current from battery when not powered

n Drives P-channel FETs, no Schottky diodes are required

n No reverse inrush current from battery into the adapter

output capacitance

n Allows for battery capacity gas-gauge calibration under

system software/firmware control

n Adapter over current threshold programmable with

external resistors

n Wide input range: 5V - 24V

LM2601 drives P-channel FETs. No high current rated

Schottky diode is required to implement an adapter switcho-

ver circuit. This significantly decreases additional heat dissi-

pation during simultaneous fast battery charging while run-

ning a computer, particularly in Maximum Performance

mode of operation

n Available in TSSOP-14 package

Applications

n Portable Computers

Features

n Detects an AC-DC adapter suitable for battery charging

or an airplane or car power line adapter that should not

be used for battery charging

n Portable IAs (Internet Appliances, Information

Appliances)

n Other Battery Powered Devices

n Allows the implementation of intelligent switchover

circuits for portable systems

Block Diagram

10130901

DS101309

www.national.com

12 3 4 5 6

中文翻译

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